Security Researchers at Standford university find a way to break the NuCaptcha Video scheme after 2 year research , he got over 90 % success rate. Last Nov, Researchers developed an automated tool that can break the text-based CAPTCHA used in many popular sites.
Elie Bursztein, Researcher shared details about their research and results. Also, Researchers notified NuCaptcha on November 21st, 2011 informing them they had an attack against their current scheme and iterated with them until December 15th 2011.
"I also want to emphasize that the goal of this post is not to demo another cool attack (even though the algorithm is pretty nifty). Rather, I want to start an open discussion on the viability of our tracking resistance principle and to allow everyone to contribute to making video captchas a viable alternative to more traditional captcha schemes." Elie Bursztein said in the blog post.
You can read more about the research here.
